<?php // $Id: view.php,v 1.106.2.5 2008/12/17 12:40:09 sam_marshall Exp $

//  Display the course home page.

	require_once('../config.php');
	require_once('lib.php');
	require_once($CFG->libdir.'/blocklib.php');
	require_once($CFG->libdir.'/ajax/ajaxlib.php');
	require_once($CFG->dirroot.'/mod/forum/lib.php');

	$id		  = optional_param('id', 0, PARAM_INT);
	$name		= optional_param('name', '', PARAM_RAW);
	$edit		= optional_param('edit', -1, PARAM_BOOL);
	$hide		= optional_param('hide', 0, PARAM_INT);
	$show		= optional_param('show', 0, PARAM_INT);
	$idnumber	= optional_param('idnumber', '', PARAM_RAW);
	$section	 = optional_param('section', 0, PARAM_INT);
	$move		= optional_param('move', 0, PARAM_INT);
	$marker	  = optional_param('marker',-1 , PARAM_INT);
	$switchrole  = optional_param('switchrole',-1, PARAM_INT);



	if (empty($id) && empty($name) && empty($idnumber)) {
		error("Must specify course id, short name or idnumber");
	}

	if (!empty($name)) {
		if (! ($course = get_record('course', 'shortname', $name)) ) {
			error('Invalid short course name');
		}
	} else if (!empty($idnumber)) {
		if (! ($course = get_record('course', 'idnumber', $idnumber)) ) {
			error('Invalid course idnumber');
		}
	} else {
		if (! ($course = get_record('course', 'id', $id)) ) {
			error('Invalid course id');
		}
	}

	preload_course_contexts($course->id);
	if (!$context = get_context_instance(CONTEXT_COURSE, $course->id)) {
		print_error('nocontext');
	}

	// Remove any switched roles before checking login
	if ($switchrole == 0 && confirm_sesskey()) {
		role_switch($switchrole, $context);
	}

	require_login($course);

	// Switchrole - sanity check in cost-order...
	$reset_user_allowed_editing = false;
	if ($switchrole > 0 && confirm_sesskey() &&
		has_capability('moodle/role:switchroles', $context)) {
		// is this role assignable in this context?
		// inquiring minds want to know...
		$aroles = get_assignable_roles($context);
		if (is_array($aroles) && isset($aroles[$switchrole])) {
			role_switch($switchrole, $context);
			// Double check that this role is allowed here
			require_login($course->id);
		}
		// reset course page state - this prevents some weird problems ;-)
		$USER->activitycopy = false;
		$USER->activitycopycourse = NULL;
		unset($USER->activitycopyname);
		unset($SESSION->modform);
		$USER->editing = 0;
		$reset_user_allowed_editing = true;
	}

	//If course is hosted on an external server, redirect to corresponding
	//url with appropriate authentication attached as parameter 
	if (file_exists($CFG->dirroot .'/course/externservercourse.php')) {
		include $CFG->dirroot .'/course/externservercourse.php';
		if (function_exists('extern_server_course')) {
			if ($extern_url = extern_server_course($course)) {
				redirect($extern_url);
			}
		}
	}


	require_once($CFG->dirroot.'/calendar/lib.php');	/// This is after login because it needs $USER

	add_to_log($course->id, 'course', 'view', "view.php?id=$course->id", "$course->id");

	$course->format = clean_param($course->format, PARAM_ALPHA);
	if (!file_exists($CFG->dirroot.'/course/format/'.$course->format.'/format.php')) {
		$course->format = 'weeks';  // Default format is weeks
	}

	$PAGE = page_create_object(PAGE_COURSE_VIEW, $course->id);
	$pageblocks = blocks_setup($PAGE, BLOCKS_PINNED_BOTH);

	if ($reset_user_allowed_editing) {
		// ugly hack
		unset($PAGE->_user_allowed_editing);
	}

	if (!isset($USER->editing)) {
		$USER->editing = 0;
	}
	if ($PAGE->user_allowed_editing()) {
		if (($edit == 1) and confirm_sesskey()) {
			$USER->editing = 1;
		} else if (($edit == 0) and confirm_sesskey()) {
			$USER->editing = 0;
			if(!empty($USER->activitycopy) && $USER->activitycopycourse == $course->id) {
				$USER->activitycopy	   = false;
				$USER->activitycopycourse = NULL;
			}
		}

		if ($hide && confirm_sesskey()) {
			set_section_visible($course->id, $hide, '0');
		}

		if ($show && confirm_sesskey()) {
			set_section_visible($course->id, $show, '1');
		}

		if (!empty($section)) {
			if (!empty($move) and confirm_sesskey()) {
				if (!move_section($course, $section, $move)) {
					notify('An error occurred while moving a section');
				}
			}
		}
	} else {
		$USER->editing = 0;
	}

	$SESSION->fromdiscussion = $CFG->wwwroot .'/course/view.php?id='. $course->id;


	if ($course->id == SITEID) {
		// This course is not a real course.
		redirect($CFG->wwwroot .'/');
	}


	// AJAX-capable course format?
	$useajax = false; 
	$ajaxformatfile = $CFG->dirroot.'/course/format/'.$course->format.'/ajax.php';
	$bodytags = '';

	if (empty($CFG->disablecourseajax) and file_exists($ajaxformatfile)) {	  // Needs to exist otherwise no AJAX by default

		// TODO: stop abusing CFG global here
		$CFG->ajaxcapable = false;		   // May be overridden later by ajaxformatfile
		$CFG->ajaxtestedbrowsers = array();  // May be overridden later by ajaxformatfile

		require_once($ajaxformatfile);

		if (!empty($USER->editing) && $CFG->ajaxcapable && has_capability('moodle/course:manageactivities', $context)) {
															 // Course-based switches

			if (ajaxenabled($CFG->ajaxtestedbrowsers)) {	 // Browser, user and site-based switches
				
				require_js(array('yui_yahoo',
								 'yui_dom',
								 'yui_event',
								 'yui_dragdrop',
								 'yui_connection',
								 'ajaxcourse_blocks',
								 'ajaxcourse_sections'));
				
				if (debugging('', DEBUG_DEVELOPER)) {
					require_js(array('yui_logger'));

					$bodytags = 'onload = "javascript:
					show_logger = function() {
						var logreader = new YAHOO.widget.LogReader();
						logreader.newestOnTop = false;
						logreader.setTitle(\'Moodle Debug: YUI Log Console\');
					};
					show_logger();
					"';
				}

				// Okay, global variable alert. VERY UGLY. We need to create
				// this object here before the <blockname>_print_block()
				// function is called, since that function needs to set some
				// stuff in the javascriptportal object.
				$COURSE->javascriptportal = new jsportal();
				$useajax = true;
			}
		}
	}

	$CFG->blocksdrag = $useajax;   // this will add a new class to the header so we can style differently


	$PAGE->print_header(get_string('course').': %fullname%', NULL, '', $bodytags);
	// Course wrapper start.
	echo '<div class="course-content">';

	$modinfo =& get_fast_modinfo($COURSE);
	get_all_mods($course->id, $mods, $modnames, $modnamesplural, $modnamesused);
	foreach($mods as $modid=>$unused) {
		if (!isset($modinfo->cms[$modid])) {
			rebuild_course_cache($course->id);
			$modinfo =& get_fast_modinfo($COURSE);
			debugging('Rebuilding course cache', DEBUG_DEVELOPER);
			break;
		}
	}

	if (! $sections = get_all_sections($course->id)) {   // No sections found
		// Double-check to be extra sure
		if (! $section = get_record('course_sections', 'course', $course->id, 'section', 0)) {
			$section->course = $course->id;   // Create a default section.
			$section->section = 0;
			$section->visible = 1;
			$section->id = insert_record('course_sections', $section);
		}
		if (! $sections = get_all_sections($course->id) ) {	  // Try again
			error('Error finding or creating section structures for this course');
		}
	}

	// Include the actual course format.
	require($CFG->dirroot .'/course/format/'. $course->format .'/format.php');
	// Content wrapper end.
	echo "</div>\n\n";


	// Use AJAX?
	if ($useajax && has_capability('moodle/course:manageactivities', $context)) {
		// At the bottom because we want to process sections and activities
		// after the relevant html has been generated. We're forced to do this
		// because of the way in which lib/ajax/ajaxcourse.js is written.
		echo '<script type="text/javascript" ';
		echo "src=\"{$CFG->wwwroot}/lib/ajax/ajaxcourse.js\"></script>\n";

		$COURSE->javascriptportal->print_javascript($course->id);
	}


	print_footer(NULL, $course);

?>
